37403 leans heavily Democratic by roughly 38 points: about 69% of voters vote Democratic and 31% Republican.
About 33% of adults in 37403 typically vote, below the U.S. average of about 62%. Among adults in 37403, ~23% vote Democratic, ~10% Republican, and ~67% don't vote. The map below shows estimated turnout by block group.
How 37403 compares
Among zip codes within 15 miles, 37403 leans more Democratic than 26 of 31 neighbors.
37403 runs about 67 points more Democratic than Tennessee as a whole. Tennessee leans Republican overall, while 37403 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 37403. The northeast side is the most Democratic-leaning (D+72) and the northwest side is the least Democratic-leaning (D+24), a spread of about 48 points.
Why 37403 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 37403, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 91% of residents in 37403 live in densely developed areas, about 55 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 37403 sits in the top quarter (about 54%, above 91% of zip codes). 37403 runs against the grain of Tennessee, a Democratic-leaning pocket in a Republican-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 37403, TN sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 37403 looks the way it does
Renters vote less often than owners. About 73% of households in 37403 rent, about 48 points above the U.S. average of 25%. High-crime urban areas turn out at lower rates, and 37403 sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
Sources and methodology
Precinct-level voting records used to fit the model come from Tennessee Secretary of State, Division of Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.